Fix builds failing for catch2 v3.8 by using specified cmake version

[AndreRicardo-Zoetis]

Fix

CMake Error at CMakeLists.txt:1 (cmake_minimum_required):
  CMake 3.16 or higher is required.  You are running version 3.13.4

As mentioned on #689 (comment)

The combination of PR Migrate catch2 v2 to v3 #683 and Public GitHub Actions for build and test #689 sees that Debian 10 is using the system version of cmake 3.13.4 that is lower than the required by catch2 v3.8, which is cmake 3.16 https://github.com/catchorg/Catch2/blob/v3.8.0/CMakeLists.txt#L1

Tested on
https://github.com/AndreRicardo-Zoetis/iot-hub-device-update/actions/runs/13564853498/job/37915573097

Also tested locally with

scripts/install-deps.sh --install-aduc-deps --install-do --install-shellcheck

--install-aduc-deps sets install_catch2=true, so it also calls the install catch2.

PS: also fixed what I believe is a typo on the name of a variable for shellcheck version.

[jw-msft]

thanks, I'm doing a run of this in gh codespace